Time-average radon daughters (WL) dosimeter for mines, indoor an

Details Time-average radon daughters (WL) dosimeter for mines, indoor an Time-average radon daughters (WL) dosimeter for mines, indoor an

1988-11-21

1989-09-05

Hannaher, Constantine

Radiant energy

Invisible radiation responsive nonelectric signalling

250253, 2504821, 2505051, G01T 102

Patent

active

048641430

ABSTRACT:
An instrument for selectively detecting alpha particles emitted simultaneously by radium A and radium C' which are derived from radon includes a device for sampling air through a filter which retains the alpha-emitting aerosols, a single detector in which the alpha particles corresponding to the respective energies of the alpha emissions of radium A and of radium C' are selectively detected, and a plurality of collimators placed between the filter and the detector whereby said collimators direct the alpha radiation from the aerosols collected by said filter to said detector. An absorber is disposed between the detector and the collimators. In addition, multiple collimators are provided to achieve improved efficiency of the device. An image analysis system is used to differentiate alpha-emitters of different energies by size.

REFERENCES:
patent: 3558884 (1971-01-01), Babich et al.
patent: 3922555 (1975-11-01), Chapuis et al.
patent: 4104523 (1978-08-01), Wolfert
patent: 4140129 (1979-02-01), Heinz et al.
patent: 4385236 (1983-05-01), Hassib et al.
patent: 4700067 (1987-10-01), Carossi et al.
J. A. Auxier, Klaus Becker, E. M. Robinson, D. R. Johnson, R. H. Boyett and C. H. Abner, "A New Radon Progeny Personnel Dosimeter", Health Physics, vol. 21, (Jul. 1971) pp. 126-128.

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